|Table of Contents|

Seismic Fragility Analysis of High-pier Multi-tower Cable-stayed Bridge Under Traveling Wave Effect(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年02期
Page:
77-83
Research Field:
Publishing date:

Info

Title:
Seismic Fragility Analysis of High-pier Multi-tower Cable-stayed Bridge Under Traveling Wave Effect
Author(s):
LI Li-feng1; 2;  CAO Fang-liang1; 2;  HU Si-cong1; 2;  CHEN Ming-yu1; 2
(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. Key Laboratory forWind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, Hunan, China)
Keywords:
cable-stayed bridge;  traveling wave effect;  seismic fragility;  uniform excitation
PACS:
TU311
DOI:
-
Abstract:
In order to study the influence of traveling wave effect on seismic performance of long-span high-pier multi-tower cable-stayed bridge, a four-tower cable-stayed bridge with ultra high-pier was taken as the analysis object, and the fragility analysis method based on probability was used. The seismic finite element analysis software OpenSees was used to establish the nonlinear dynamic finite element model of whole bridge. A suite of 80 ground motions typically were selected from database PEER, and the displacement input method was used to carry out multi-point excitations to account for the influence of traveling wave effect. Considering seven different shear wave velocities and uniform excitation, the whole process of non-linear analysis was completed. According to the characteristics of bridge, considering three kinds of longitudinal restraint systems of whole bridge, the supports, cables, girders and pylons were selected as vulnerable members, and PGD(peak ground displacement)was selected as the index of earthquake ground motion intensity after comparison. The seismic probabilistic demand model of structures was established, the fragility curves of fragility members were calculated and drawn, and the MPGD(PGD value of component corresponding damage transcendence probability Pf = 50%)was selected as the damage evaluation index of components. The results show that the support is the most vulnerable component, and the tower is relatively minimal in vulnerability. The traveling wave effect is beneficial to the seismic resistance of the support, the longitudinal fully constraint and semi-constraint systems. With the increase of wave speed, the seismic resistance of various components and systems tends to be the result of uniform excitation.

References:

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Last Update: 2019-03-27